console.log("123");
// dev1功能
console.log("dev1");
// dev1 bug 修复
alert("dev1");
// dev2功能
console.log("dev2");
// dev2 bug fix
alert("dev2");

console.log("dev3");
console.log("dev4");
console.log("dev5");
alert("dev5");
console.log("dev5-6");
alert("dev5-6");
console.log("dev5-7");
alert("dev5-7");

console.log("dev6");

console.log("dev7");

console.log("dev8");
console.log("dev8-1");

console.log("dev9");
console.log("dev10");
console.log("dev11");
console.log("dev12");
console.log("dev13-2");
console.log("dev15");
console.log("dev13-1");
console.log("dev14");
console.log("dev16-11");

function add(a, b) {
  a = a * 2;
  return a + b + b;
}
